/Engine/Source/Runtime/SlateCore/Public/Input/Reply.h
Ask Slate to detect if a user started dragging in this widget. If a drag is detected, Slate will send an OnDragDetected event.
[FReply](API\Runtime\SlateCore\Input\FReply) & DetectDrag ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > & DetectDragInMe, [FKey](API\Runtime\InputCore\FKey) MouseButton )